JP3753862B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP3753862B2
JP3753862B2 JP09690898A JP9690898A JP3753862B2 JP 3753862 B2 JP3753862 B2 JP 3753862B2 JP 09690898 A JP09690898 A JP 09690898A JP 9690898 A JP9690898 A JP 9690898A JP 3753862 B2 JP3753862 B2 JP 3753862B2
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main body
body cover
cam
lever
switch
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JP09690898A
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JPH11277842A (en
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武男 須田
洋 吉永
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority to JP09690898A priority Critical patent/JP3753862B2/en
Priority to CNB991041631A priority patent/CN100357833C/en
Priority to KR1019990010208A priority patent/KR100324099B1/en
Priority to US09/277,174 priority patent/US6055394A/en
Publication of JPH11277842A publication Critical patent/JPH11277842A/en
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Publication of JP3753862B2 publication Critical patent/JP3753862B2/en
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
    • E05C17/04—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means with a movable bar or equivalent member extending between frame and wing
    • E05C17/12—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means with a movable bar or equivalent member extending between frame and wing consisting of a single rod
    • E05C17/24—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means with a movable bar or equivalent member extending between frame and wing consisting of a single rod pivoted at one end, and with the other end running along a guide member
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1604—Arrangement or disposition of the entire apparatus
    • G03G21/1623—Means to access the interior of the apparatus
    • G03G21/1633—Means to access the interior of the apparatus using doors or covers
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B2047/0048—Circuits, feeding, monitoring
    • E05B2047/0067—Monitoring
    • E05B2047/0068—Door closed
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
    • G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
    • G03G2221/1678—Frame structures
    • G03G2221/1687—Frame structures using opening shell type machines, e.g. pivoting assemblies
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
    • G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
    • G03G2221/1678—Frame structures
    • G03G2221/169—Structural door designs

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Facsimiles In General (AREA)
  • Control Or Security For Electrophotography (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、複写機、ファックス、プリンターなどの電子写真式画像形成装置に関し、特に、本体カバーの閉開を識別するスイッチ機構に関する。
【０００２】
【従来の技術】
一般に、装置本体に対する本体カバーの開閉状態を識別するためのスイッチ機構として、装置本体側にリミットスイッチからなるスイッチを配設し、本体カバー側にこのスイッチと対応する位置に操作部材を設け、本体カバーが閉じられたとき、上記操作部材が上記スイッチと接触し作動させるスイッチ機構が、一般に採用されている。
【０００３】
通常、上記操作部材は、レバー形状の部材であり、本体カバーの内面に立設された状態で使用される。また、この本体カバーは、樹脂で成形された大きな平板状の形状であり、そりが発生しやすく、ねじれに対する強度も弱い。このため、上記スイッチを操作する上記レバーの位置を、このスイッチの位置に対して高精度に保つことが困難であり、検知のための作動範囲が数ミリと非常に狭い上記スイッチの誤作動が問題となっている。
【０００４】
さらに、メンテナンス時において、作業者は、本体カバーを開いて作業をするが、上記レバーが本体カバーから突出しているため、これが作業に邪魔となり、ときには体が接触し、レバーを破損させることも多かった。
【０００５】
そこで、上記誤作動を防止するために、部品寸法を厳しくすることで高精度な位置決めを行うにはコストがかかり過ぎる。また、上記問題に対して、特開平８−２８５１８３号公報には、上記レバーとスイッチとの間にガイド部材を設け、このガイド部材にレバーを案内させるスイッチ機構、及び、その本体カバーの開閉の動作とリンクさせて上記レバーを回動自在に本体カバー内に畳み込む機構を有する画像形成装置が開示されている。
【０００６】
【発明が解決しようとする課題】
しかし、上記画像形成装置（特開平８−２８５１８３号）では、上記スイッチの狭い作動範囲に対し、上記レバーによる確実な操作は確保されていない。すなわち、本体カバーの前後方向の位置決めはされていないため、レバーが届かず不十分な接触による誤作動が生じることも考えられ、ガイド部材によるレバーの案内の効果は十分に発揮されていない。また、スイッチ機構とは直接に関係がないレバーの畳み込み機構を本体カバー内に設けるのでは構成が複雑となる。
【０００７】
そこで、本発明の目的は、コストのかかる高精度の位置決めを不要とし、安価な構成で上記スイッチの狭い作動範囲に対する操作を確実としたスイッチ機構を有し、操作部材であるレバーが、その構成上本体カバー内に収納できる画像形成装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成する本発明の画像形成装置は、装置本体に対して開閉自在に設けられた本体カバーと、該本体カバーの開閉状態を識別するスイッチ機構とを有する画像形成装置において、上記スイッチ機構が、上記装置本体側に配設されたスイッチと、その円弧表面上の一の接線に沿って形成された直線部分を有し、上記スイッチをその回転で作動させるカムと、その先端部の少なくとも一部に該先端部の移動方向に沿って形成され上記直線部分と当接可能な直線形状部を有し、その基端部で上記本体カバーに回動自在に支持され該本体カバーの閉時の移動により上記カムを回転させることが可能なレバーとからなり、上記本体カバーが閉じるとき、上記レバーの先端部が上記直線部分に当接し上記カムを所定の角度回転させることにより上記スイッチを作動させた後、上記直線形状部と上記直線部分とが平行な状態で当接し、上記直線形状部が上記直線部分上をスリップしながら移動することによって、上記カムの回転が上記所定の角度に抑制されることを特徴としている。
【０００９】
請求項１記載の画像形成装置において、上記カムは、上記直線部分の近傍に被係止部材を有し、上記レバーの先端部は、上記被係止部材と対応する位置に係止部材を有し、上記本体カバーが開くとき、上記被係止部材と上記係止部材とが係合して、上記カムを元の位置に戻すことを特徴としている。
【００１０】
請求項１または２記載の画像形成装置において、上記レバーは、上記先端部近くで上記装置本体側に設けられたガイド部材に移動自在に案内されるものであり、該ガイド部材により上記本体カバーの開閉・移動範囲が規制されることを特徴としている。
【００１２】
【発明の実施の形態】
以下、本発明の画像形成装置の一実施例を図面に基づいて説明する。まず、図１は、本実施例の画像形成装置について要部構成の概略を示している。本実施例の画像形成装置は、装置本体の側面を構成する本体フレーム１と、この本体フレーム１に支持され、上記装置本体に対して開閉自在である本体カバー２とを有する。また、本体カバー２の開閉状態を識別するスイッチ機構は、その基本的構成として、本体フレーム１に設けられたリミットスイッチからなるスイッチ３と、本体フレーム１に回動自在に支持され、スイッチ３に隣接して配置されるカム４と、本体カバー２の開閉時の移動によりカム４を回動させることが可能なレバー５とからなるものである。
【００１３】
レバー５は、本体カバー２の側面にその基端部を回動白在に支持され、その先端部から数センチの位置に横へ突出する円柱形の嵌合部５ａを有しており、この嵌合部５ａを設けた部分より先の部分を先端部５ｂとしている。このレバー５は、このレバー５を案内するガイド部材として本体フレーム１に「く」の字状に成形されたガイド孔１ａに上記嵌合部５ａで遊嵌され、このレバー５の先端部５ｂが、このガイド孔１ａに沿って一定の軌跡で移動可能となっている。また、この先端部５ｂは、本体カバー２が閉じられるとガイド孔１ａの上端へ移動し、このガイド孔１ａの上端の延長上に配設されているカム４に当接するものである。この先端部５ｂの当接でカム４を回転させることにより、スイッチ３が作動する。このようにして、本体カバー２が閉じられたことを検知可能とする。
【００１４】
図２は、上記スイッチ機構について、カム４の回転でスイッチ３が作動した状態を示す拡大図である。本実施例の画像形成装置で使用されるスイッチ機構の詳細構成は、カム４と、レバー５と、スイッチ３とからなる。カム４は、その円弧表面上の一の接線に沿った直線部分として成形された板状部４ａを有する。また、レバー５の先端部５ｂの下面部５ｃは直線形状となっている。カム４には、突起４ｂがあり、このカム４が回転することによってスイッチ３の検知部材３ａを、上記突起４ｂで押してスイッチ３のオンオフを行う。
【００１５】
この図２では、本体カバー２が完全に閉じられたときの状態を示しており、レバー５の嵌合部５ａは、ガイド孔１ａの上端付近に達している。この図に示すように、本体カバー２の閉じる方向の動作により、上記先端部５ｂは、ガイド孔１ａに案内されてこのガイド孔１ａの上端付近に達するとき、その先端部５ｂがカム４の板状部４ａに当接し、このカム４を破線で表した位置から実線で表した位置まで回転させる。このようにカム４が回転すると、スイッチ３は、カム４の突起４ｂにより検知部材３ａが押されて作動する。
【００１６】
本実施例の上記スイッチの機構において、上記カム４の回転は、このカム４の板状部４ａと、レバー５の先端部５ｂの下面部５ｃとが平行に接触するところで停止する。ここで、先端部５ｂが所定の位置で止まらずにさらに奥へ移動しても上記平行に接触する部分でスリップするため、カム４の回転は抑制される。また、本体カバー２などの位置決めが不十分であり、カム４に対する先端部５ｂの位置が前後に多少ラフであっても、上記カム４の回転角は一定に保たれる。
【００１７】
このようにして、先端部５ｂの移動は、一定回転角でのカム４の回転に変換され、この回転による検知部材３ａの先端の一定の変位としてスイッチ３に検知される上記スイッチ機構においては、本体カバー２の開閉状態の識別は確実となり、その誤作動は生じなくなる。
【００１８】
なお、本実施例のスイッチ機構において、上記カム４の直線部分である板状部４ａ、及び上記レバー５の先端部５ｂに形成された直線形状である下面部５ｃは、それぞれが平面として構成されているが、単に直線的に接するものであっても足りる。例えば、上記レバー５の先端部５ｂが円柱形又は円錐形であって、板状部４ａと線接触しても同様に機能する。
【００１９】
なお、図２は、本体カバー２が完全に閉じられた状態を示すが、この図に示すように、ガイド孔１ａの上端と、レバー５の嵌合部５ａとの間には多少の隙間空間１ｂが残る。このようにガイド孔１ａの穿孔位置や、形状を設定することで、本体カバー２を閉じたときの嵌合部５ａの位置決めが不十分であって、上端側に多少ずれても本体カバー２を完全に閉じることが可能となる。
【００２０】
また、逆に本体カバー２を開いたときは先端部５ｂが、カム４の板状部４ａ上から離れるが、本体カバー２が開かれたことを識別するために上記カム４が元の位置に戻りスイッチ３がオフされる必要がある。このため、通常、カム４を時計方向へ回転させるためのバネ機構などによる付勢手段を設けるが、本実施例のスイッチ機構においては、そのような付勢手段を設けずに、簡単な構成で上記カム４を図２の鎖線で示した元の位置に戻す手段を設けることができる。
【００２１】
図３から図５を参照して、カム４を元の位置に戻す手段について説明する。図３は、レバー５の先端部５ｂの詳細構成を示し、（ａ）は装置本体側からの斜視図であり、（ｂ）は本体カバー２側からの斜視図である。これらの図に示すように先端部５ｂは、切り欠き状に成形された斜面であって板状部４ａと当接する押し部５ｂ′と、その下面部５ｃより下方に突き出るように形成された係止部５ｂ"とを有している。
【００２２】
図４は、上記先端部５ｂと一緒に使用するカム４の詳細構成を示し、このカム４の板状部４ａのうち、符号４ａ′で示す部分は、上記先端部５ｂの押し部５ｂ′が当接する当接面である。また、この板状部４ａの一角、すなわち上記当接面とは異なる箇所であって上記当接面４ａ′より手前近傍には上記係止部５ｂ″と対応する被係止部４ａ″が設けられてる。
【００２３】
図５に、上記先端部５ｂが上記カム４を回動させる様子を示す。本体カバー２が閉じるとき、先端部５ｂの押し部５ｂ′と、板状部４ａの当接面４ａ′とがぶつかり（同図（ａ））、レバー５の下面部５ｃとカム４の板状部４ａとが平行になるところまでカム４が回転する（同図（ｂ））。その後、本体カバー２が開かれたとき、先端部５ｂが板状部４ａから離れる際に、その先端部５ｂの係止部５ｂ″とカム４の被係止部４ａ″とが係合し、カム４を時計方向に回転させ（同図（ｃ））、このカム４を元の位置に戻すことができる。
【００２４】
つぎに、本実施例の画像形成装置の概略構成を示し、特にレバー５の他の作用について説明する。
図６に、本体カバー２が完全に開かれた状態での本実施例の概略構成を示す。上記レバー５は、その一端で上記本体カバー２に回動可能に支持され、装置本体部側の他端では、ガイド部材である本体フレーム１に設けたガイド孔１ａに、その嵌合部５ａで移動自在に嵌合するものであり、このガイド部材により上記本体カバー２の移動範囲が規制されたものである。
【００２５】
図６に示すように、本体カバー２の全開状態では、レバー５の嵌合部５ｂが、ガイド孔１ａの下端に突き当たり、このレバー５より本体カバー２が所定の位置に保持される。このように上記レバー５は、上記スイッチ３に対する操作部材としてだけでなく、ガイド孔１ａとともに本体カバー２を支えるストッパ機構を構成する。
また、この図に示されるように、本体カバー２が完全に開いたときに本体フレーム１から外部に突き出る部分は、本体カバー２内の中空部分に完全に収容される。このように、レバー５の収容位置をも考慮して上記ガイド孔１ａ及びレバー５の形状が定められている。
【００２６】
また、本実施例の画像形成装置は、作像系にプロセスカートリッジ６を使用するものである。図６に示すように、このプロセスカートリッジ６は、感光体７などの作像機器を一体的に構成したものであり、本体カバー２を開いた状態で、装置本体の略中央にセットして使用される。また、上記プロセスカートリッジ６には、感光体７を保護するための感光体カバー８が設けられおり、後に詳述するが、この感光体カバー８は、本体カバー２が閉じるときのレバー５の移動により持ち上げられて開かれ、上記感光体７を作像プロセスに使用可能な状態にする。
【００２７】
図７に、上記感光体７及び感光体カバー８の構成、及びこれらとガイド孔１ａとの位置関係を示す。この感光体カバー８は、感光体７を覆う状態に不図示のスプリングで付勢されており、図６でも示したように、本体カバー２が開いた状態では感光体７を完全に覆っている。
【００２８】
また、上記感光体カバー８には、ガイド孔１ａの下端に向いた平面９ａを有する突部９が、ガイド孔１ａ側の端部に設けられており、図に示すように、本体カバー２が開いているときは、この突部９は、ガイド孔１ａの屈曲部近くでその直横に位置している。ここでは図示を省略しているが、上記突部９より下端側では、上記レバー５の嵌合部５ａが外側からこのガイド孔１ａを貫通しており、上記平面９ａは、この嵌合部５ａの貫通先の円柱部分と対応するものである。
【００２９】
図８に、本体カバー２が開かれたときに上記レバー５の嵌合部５ａが、上記感光体カバー８を持ち上げるところの動作を示す。この図の（ａ）に示すように、本体カバー２が開かれると、レバー５の嵌合部５ａは、ガイド孔１ａが屈曲する付近まで移動し、図の奥側へ突き出たその円柱部分で、上記突部９の平面９ａと当接する。（ｂ）に示すように、嵌合部５ａがさらに上端へ移動すると、感光体カバー８は、突部９で押されて反時計方向に回動し、その平面９ａがガイド孔１ａの下側の周縁と平行になるところで保持される。この（ｂ）では、本体カバー２が完全に閉じた状態であり、上記平面９ａがガイド孔１ａの下側の周縁と平行となるため、ガイド孔１ａ内での嵌合部５ａの停止位置が多少前後するときでも、感光体カバー８を一定の位置に保持することができ、この点においても本体カバー２などの高精度な位置決めは不要である。なお、上記感光体カバー８は、上記したようにスプリングで時計方向に付勢されているので本体カバー２が開かれると元の位置に戻ることができる。
【００３０】
【発明の効果】
本発明によれば、スイッチ機構が、装置本体側に配設されたスイッチと、その円弧表面上の一の接線に沿って形成された直線部分を有し、スイッチをその回転で作動させるカムと、その先端部の少なくとも一部に該先端部の移動方向に沿って形成されカムの直線部分と当接可能な直線形状部を有し、その基端部で本体カバーに回動自在に支持され本体カバーの閉時の移動によりカムを回転させることが可能なレバーとからなり、本体カバーが閉じるとき、レバーの先端部がカムの直線部分に当接しカムを所定の角度回転させることによりスイッチを作動させた後、レバーの直線形状部とカムの直線部分とが平行な状態で当接し、レバーの直線形状部がカムの直線部分上をスリップしながら移動することによって、カムの回転が所定の角度に抑制されるので、スイッチの誤作動がなくなるとともに、レバーのスイッチに対する高精度な位置決めが不要となり安価な構成となる。
【００３１】
本発明によれば、カムは、直線部分の近傍に被係止部材を有し、レバーの先端部は、カムの被係止部材と対応する位置に係止部材を有し、本体カバーが開くとき、カムの被係止部材とレバーの係止部材とが係合して、カムを元の位置に戻すことにより、カムを元の位置に戻すための付勢手段が不要となり、部品点数を減らすことができる。
【００３２】
また、本発明によれば、レバーは、その先端部近くで装置本体側に設けられたガイド部材に移動自在に案内されるものであり、該ガイド部材により本体カバーの開閉・移動範囲が規制されることにより、レバー及びガイド部材が、本体カバーを所定の位置に保持できるストッパ機構をも兼ねるので、部品点数を減らすことができる。
【図面の簡単な説明】
【図１】本発明の一実施例を示す画像形成装置の要部の概略的な斜視図である。
【図２】本実施例におけるスイッチ機構の拡大構成図である。
【図３】上記スイッチ機構で使用するレバーの先端部の詳細構成図であって、（ａ）は、装置本体側から見た斜視図であり、（ｂ）は、本体カバー側から見た斜視図である。
【図４】図３のレバーと一緒に使用するカムの詳細構成を示す斜視図である。
【図５】図３のレバーが、図４のカムを回動させる動作の説明図であって、(ａ)及び（ｂ）は、本体カバーが閉じるときの動作を示し、（ｃ）では、本体カバーが開くときの動作を示す図である
【図６】本実施例の画像形成装置について本体カバーが開いた状態の概略構成を示す図である。
【図７】本実施例の画像形成装置で使用する感光体、及び感光体カバーの拡大構成を示す図である。
【図８】レバーの嵌合部が感光体カバーを持ち上げる動作の説明図である。
【符号の説明】
１ 本体フレーム（装置本体）
１ａ ガイド孔 ( ガイド部材 )
２ 本体カバー
３ スイッチ
４ カム４ａ カムの板状部（直線部分）
４ａ" 被係止部（被係止部材）
５ レバー
５ａ レバーの嵌合部（レバーの先端部）
５ｂ" レバーの係止部（係止部材）
５ｃ レバー先端部の下面部（直線形状） [0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrophotographic image forming apparatus such as a copying machine, a fax machine, and a printer, and more particularly to a switch mechanism that identifies opening and closing of a main body cover.
[0002]
[Prior art]
Generally, as a switch mechanism for identifying the open / close state of the main body cover with respect to the apparatus main body, a switch comprising a limit switch is provided on the apparatus main body side, and an operation member is provided on the main body cover side at a position corresponding to the switch. A switch mechanism is generally employed in which when the cover is closed, the operation member contacts and operates the switch.
[0003]
Usually, the operation member is a lever-shaped member, and is used in a state of being erected on the inner surface of the main body cover. Further, the main body cover has a large flat plate shape formed of a resin, is likely to warp, and has low strength against twisting. For this reason, it is difficult to maintain the position of the lever for operating the switch with high accuracy with respect to the position of the switch, and the malfunction of the switch is very narrow as the operation range for detection is several millimeters. It is a problem.
[0004]
Furthermore, during maintenance, the operator opens the main body cover and works, but since the lever protrudes from the main body cover, this interferes with the work, and sometimes the body comes into contact with the lever and damages the lever. It was.
[0005]
Therefore, in order to prevent the malfunction, it is too expensive to perform highly accurate positioning by tightening the component dimensions. In order to solve the above problem, Japanese Patent Application Laid-Open No. 8-285183 discloses a switch mechanism for providing a guide member between the lever and the switch, and guiding the lever to the guide member, and opening / closing of the main body cover. An image forming apparatus having a mechanism that is linked to an operation and that folds the lever into a main body cover so as to be rotatable is disclosed.
[0006]
[Problems to be solved by the invention]
However, in the image forming apparatus (Japanese Patent Laid-Open No. 8-285183), a reliable operation by the lever is not secured for a narrow operating range of the switch. That is, since the main body cover is not positioned in the front-rear direction, the lever does not reach and malfunction due to insufficient contact may occur, and the effect of guiding the lever by the guide member is not sufficiently exhibited. Further, if a lever folding mechanism that is not directly related to the switch mechanism is provided in the main body cover, the configuration becomes complicated.
[0007]
Accordingly, an object of the present invention is to provide a switch mechanism that eliminates the need for costly high-precision positioning and ensures the operation over a narrow operating range of the switch with an inexpensive configuration, and a lever as an operation member has the configuration An object of the present invention is to provide an image forming apparatus that can be stored in an upper body cover.
[0008]
[Means for Solving the Problems]
The image forming apparatus of the present invention that achieves the above object includes: a main body cover that can be opened and closed with respect to the main body of the apparatus; and a switch mechanism that identifies an open / closed state of the main body cover. Has a switch disposed on the apparatus main body side, a linear portion formed along one tangent on the arc surface thereof, a cam for operating the switch by its rotation, and at least a tip of the switch A portion having a linear shape portion formed along the moving direction of the distal end portion and capable of abutting on the linear portion, and supported at the base end portion so as to be rotatable on the main body cover, when the main body cover is closed. moved by it and a lever capable of rotating the cam, the when the body cover is closed, the upper by the tip of the lever causes the contact rotating the cam at a predetermined angle to the straight portion After the switch is operated, the linear shape portion and the linear portion abut in a parallel state, and the linear shape portion moves while slipping on the linear portion, whereby the rotation of the cam is the predetermined amount. It is characterized by being restrained by an angle .
[0009]
2. The image forming apparatus according to claim 1, wherein the cam has a locked member in the vicinity of the linear portion, and the tip of the lever has a locking member at a position corresponding to the locked member. And when the said main body cover opens, the said to-be-latched member and the said latching member engage, and the said cam is returned to the original position, It is characterized by the above-mentioned.
[0010]
3. The image forming apparatus according to claim 1, wherein the lever is movably guided by a guide member provided on the apparatus main body side near the distal end portion, and the main cover of the main body cover is guided by the guide member. It is characterized by its opening / closing / moving range being restricted.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 shows an outline of the main configuration of the image forming apparatus of this embodiment. The image forming apparatus of the present embodiment includes a main body frame 1 that constitutes a side surface of the apparatus main body, and a main body cover 2 that is supported by the main body frame 1 and can be opened and closed with respect to the apparatus main body. The switch mechanism for identifying the open or closed state of the body cover 2, As a basic configuration, a switch 3 comprising a limit switch provided on the body frame 1, is rotatably supported on the body frame 1, scan a cam 4 which is positioned adjacent to the switch 3, science arm 4 by the movement of the opening and closing of the body cover 2 is intended can lever 5 Toka Ranaru be rotated.
[0013]
Lever 5, the base end portion on the side surface of the body cover 2 is supported on the rotating white standing, has a fitting portion 5a of the cylindrical projecting from its distal end to the next to several centimeters position A portion ahead of the portion provided with the fitting portion 5a is a tip portion 5b. The lever 5 is loosely fitted in a guide hole 1a formed in a “<” shape in the main body frame 1 as a guide member for guiding the lever 5 by the fitting portion 5a, and a distal end portion 5b of the lever 5 is The guide hole 1a can be moved along a fixed locus. The tip 5b moves to the upper end of the guide hole 1a when the main body cover 2 is closed, and comes into contact with the cam 4 disposed on the extension of the upper end of the guide hole 1a. By rotating the cam 4 by abutting of the distal end portion 5b, switch 3 is operated. In this way, it enables detecting that the body cover 2 is closed.
[0014]
Figure 2, for the switch mechanism, which is an enlarged view showing a state where the rotation Death switch 3 of cams 4 has been activated. The detailed configuration of the switch mechanism used in the image forming apparatus according to the present embodiment includes a cam 4, a lever 5, and a switch 3 . Cams 4 has a plate-like portion 4a, which is formed as a straight portion along the one tangent on the arc surface. The lower surface portion 5c of the distal end portion 5b of the lever 5 has a linear shape. The cams 4, there are projections 4b, and the detecting member 3a of the switch 3 by the cam 4 rotates, turning on and off of the switch 3 when pressed by the projection 4b.
[0015]
In FIG 2 shows a state in which the body cover 2 is completely closed, the fitting portion 5a of the lever 5 has reached the vicinity of the upper end of the guide hole 1a. As shown in the figure, when the tip 5b is guided by the guide hole 1a and reaches the vicinity of the upper end of the guide hole 1a by the operation in the closing direction of the main body cover 2, the tip 5b becomes the plate of the cam 4. The cam 4 is brought into contact with the shape portion 4a and rotated from the position indicated by the broken line to the position indicated by the solid line. With such cam 4 is rotated, the switch 3 is actuated by the detecting member 3a is pressed by the projections 4b of the cam 4.
[0016]
In the switch mechanism of this embodiment, the rotation of the cam 4 stops when the plate-like portion 4a of the cam 4 and the lower surface portion 5c of the tip portion 5b of the lever 5 come in parallel contact. Here, even if the distal end portion 5b does not stop at a predetermined position and moves further to the back, the tip 4b slips at the portion in contact with the parallel portion, so that the rotation of the cam 4 is suppressed. Further, even if the positioning of the main body cover 2 and the like is insufficient and the position of the tip portion 5b with respect to the cam 4 is somewhat rough forward and backward, the rotation angle of the cam 4 is kept constant.
[0017]
In this way, in the switch mechanism in which the movement of the tip 5b is converted into the rotation of the cam 4 at a constant rotation angle and detected by the switch 3 as a constant displacement of the tip of the detection member 3a due to this rotation, Identification of the open / closed state of the main body cover 2 is ensured, and the malfunction does not occur.
[0018]
In the switch mechanism of the present embodiment, the plate-like portion 4a that is a straight portion of the cam 4 and the lower surface portion 5c that is a straight shape formed at the tip portion 5b of the lever 5 are each configured as a plane. However, it is sufficient if it is just a straight line. For example, the tip 5b of the lever 5 has a columnar shape or a conical shape, and functions in the same manner even if it makes line contact with the plate-like portion 4a.
[0019]
2 shows a state in which the main body cover 2 is completely closed. As shown in FIG. 2, there is a slight gap space between the upper end of the guide hole 1a and the fitting portion 5a of the lever 5. 1b remains. Puncturing positions and of the thus guide hole 1a, by setting the shape, a poor positioning of the fitting portion 5a of closing the body cover 2, the main body cover 2 is also slightly shifted to the upper end Can be completely closed .
[0020]
On the other hand, when the main body cover 2 is opened, the tip 5b moves away from the plate-like portion 4a of the cam 4, but the cam 4 is returned to its original position to identify that the main body cover 2 has been opened. The return switch 3 needs to be turned off. For this reason, an urging means such as a spring mechanism for rotating the cam 4 in the clockwise direction is usually provided. However, the switch mechanism of this embodiment has a simple configuration without providing such an urging means. Means can be provided for returning the cam 4 to the original position indicated by the chain line in FIG.
[0021]
Referring to FIGS. 3 to 5, it will be described means for returning the cam 4 to the original position. 3A and 3B show a detailed configuration of the distal end portion 5b of the lever 5. FIG. 3A is a perspective view from the apparatus main body side, and FIG. 3B is a perspective view from the main body cover 2 side. As shown in these drawings, the front end portion 5b is a notch-shaped slope, a pressing portion 5b 'that comes into contact with the plate-like portion 4a, and a latch formed so as to protrude downward from the lower surface portion 5c. And a stop portion 5b ".
[0022]
FIG. 4 shows a detailed configuration of the cam 4 used together with the tip portion 5b. Of the plate-like portion 4a of the cam 4, the portion indicated by reference numeral 4a ′ is the pressing portion 5b ′ of the tip portion 5b. It is the contact surface which contacts. Further, a locked portion 4a ″ corresponding to the locking portion 5b ″ is provided at one corner of the plate-like portion 4a, that is, at a location different from the contact surface and in the vicinity of the contact surface 4a ′. It is
[0023]
FIG. 5 shows a state where the tip 5b rotates the cam 4. When the main body cover 2 is closed, the pushing portion 5b 'of the tip 5b and the contact surface 4a' of the plate-like portion 4a collide with each other (FIG. 5A), and the lower surface portion 5c of the lever 5 and the plate-like shape of the cam 4 The cam 4 rotates until the portion 4a is parallel to the portion 4a ((b) in the figure). After that, when the main body cover 2 is opened, when the tip portion 5b is separated from the plate-like portion 4a, the locking portion 5b "of the tip portion 5b and the locked portion 4a" of the cam 4 are engaged, The cam 4 can be rotated clockwise ((c) in the figure) to return the cam 4 to its original position.
[0024]
Next, a schematic configuration of the image forming apparatus of the present embodiment is shown, and in particular, other actions of the lever 5 will be described.
FIG. 6 shows a schematic configuration of the present embodiment in a state where the main body cover 2 is completely opened. The lever 5 is rotatably supported by the main body cover 2 at one end thereof, and at the other end on the apparatus main body side, the fitting hole 5a is provided in the guide hole 1a provided in the main body frame 1 serving as a guide member. The movable cover is movably fitted, and the moving range of the main body cover 2 is regulated by the guide member.
[0025]
As shown in FIG. 6, in the fully opened state of the main body cover 2, the fitting portion 5 b of the lever 5 hits the lower end of the guide hole 1 a and the main body cover 2 is held at a predetermined position by the lever 5. Thus, the lever 5 constitutes not only an operation member for the switch 3 but also a stopper mechanism for supporting the main body cover 2 together with the guide hole 1a.
Further, as shown in this figure, when the main body cover 2 is completely opened, the portion protruding to the outside from the main body frame 1 is completely accommodated in the hollow portion in the main body cover 2. Thus, the shape of the guide hole 1a and the lever 5 is determined in consideration of the housing position of the lever 5.
[0026]
Further, the image forming apparatus of this embodiment uses a process cartridge 6 for an image forming system. As shown in FIG. 6, this process cartridge 6 is an integrated construction of an image forming device such as a photoconductor 7, and is used by being set at the approximate center of the apparatus main body with the main body cover 2 opened. Is done. The process cartridge 6 is provided with a photoconductor cover 8 for protecting the photoconductor 7, which will be described in detail later. The photoconductor cover 8 moves the lever 5 when the main body cover 2 is closed. Is lifted and opened to make the photoconductor 7 usable for the image forming process.
[0027]
FIG. 7 shows the structure of the photoreceptor 7 and the photoreceptor cover 8, and the positional relationship between these and the guide hole 1a. The photoconductor cover 8 is urged by a spring (not shown) so as to cover the photoconductor 7, and completely covers the photoconductor 7 when the main body cover 2 is opened as shown in FIG. .
[0028]
Further, the photosensitive member cover 8 is provided with a protrusion 9 having a flat surface 9a facing the lower end of the guide hole 1a at the end on the guide hole 1a side. As shown in FIG. When open, the protrusion 9 is positioned directly beside the bent portion of the guide hole 1a. Although not shown here, on the lower end side of the protrusion 9, the fitting portion 5a of the lever 5 penetrates the guide hole 1a from the outside, and the flat surface 9a has the fitting portion 5a. It corresponds to the cylindrical part of the penetration destination.
[0029]
FIG. 8 shows an operation in which the fitting portion 5a of the lever 5 lifts the photoreceptor cover 8 when the main body cover 2 is opened. As shown in (a) of this figure, when the main body cover 2 is opened, the fitting part 5a of the lever 5 moves to the vicinity where the guide hole 1a is bent, and the cylindrical part protruding to the back side of the figure. , Abuts against the flat surface 9a of the protrusion 9. As shown in (b), when the fitting portion 5a further moves to the upper end, the photoconductor cover 8 is pushed by the protrusion 9 and rotates counterclockwise, and the flat surface 9a is below the guide hole 1a. It is held where it is parallel to the periphery of In (b), the main body cover 2 is in a completely closed state, and the plane 9a is parallel to the lower peripheral edge of the guide hole 1a, so that the stop position of the fitting portion 5a in the guide hole 1a is The photoreceptor cover 8 can be held at a fixed position even when moving back and forth slightly, and in this respect as well, high-precision positioning of the main body cover 2 and the like is unnecessary. Since the photosensitive member cover 8 is urged clockwise by the spring as described above, it can return to its original position when the main body cover 2 is opened.
[0030]
【The invention's effect】
According to the present invention, the switch mechanism has a switch disposed on the apparatus main body side, a cam having a linear portion formed along one tangent on the arc surface, and operating the switch by its rotation; The front end portion has a linear shape portion formed along the moving direction of the front end portion and capable of coming into contact with the straight portion of the cam. The base end portion of the front end portion is rotatably supported by the main body cover. It consists of a lever that can rotate the cam by the movement of the body cover when it is closed. After the operation, the linear part of the lever and the linear part of the cam abut in a parallel state, and the linear part of the lever moves while slipping on the linear part of the cam. Depressed at an angle Since the, with erroneous switch operation is eliminated, and accurate positioning inexpensive unnecessary structure to the switch lever.
[0031]
According to the present invention, the cam has a locked member in the vicinity of the linear portion, and the tip of the lever has the locking member at a position corresponding to the locked member of the cam , and the main body cover opens. When the locked member of the cam is engaged with the locking member of the lever and the cam is returned to the original position, the biasing means for returning the cam to the original position becomes unnecessary, and the number of parts is reduced. Can be reduced.
[0032]
Further, according to the present invention, the lever is guided movably by a guide member provided on the apparatus main body side near the tip , and the opening / closing / moving range of the main body cover is regulated by the guide member. As a result, the lever and the guide member also serve as a stopper mechanism that can hold the main body cover in a predetermined position, so that the number of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a main part of an image forming apparatus showing an embodiment of the present invention .
FIG. 2 is an enlarged configuration diagram of a switch mechanism in the present embodiment.
[Figure 3] A detailed block diagram of the distal end portion of the lever to be used in the switch mechanism, (a) is a perspective view seen from the apparatus main body, (b) is viewed from the body cover side It is a perspective view.
4 is a perspective view showing a detailed configuration of a cam used together with the lever of FIG. 3;
5 is an explanatory view of the operation of the lever of FIG. 3 for rotating the cam of FIG. 4; (a) and (b) show the operation when the main body cover is closed; FIG. 6 is a diagram illustrating an operation when the main body cover is opened. FIG. 6 is a diagram illustrating a schematic configuration of the image forming apparatus according to the present exemplary embodiment in a state where the main body cover is opened.
[7] photoreceptor for an image forming apparatus of this embodiment, and shows an enlarged configuration of the photosensitive member cover.
FIG. 8 is an explanatory diagram of an operation in which the fitting portion of the lever lifts the photoreceptor cover.
[Explanation of symbols]
1 body frame (device body)
1a Guide hole ( guide member )
2 Body cover 3 Switch 4 Cam 4a Plate-like part of cam (straight line part)
4a " locked portion (locked member)
5 Lever 5a Lever fitting part (lever tip)
5b "lever locking part (locking member)
5c Lever tip bottom surface (linear shape)

Claims (3)

装置本体に対して開閉自在に設けられた本体カバーと、該本体カバーの開閉状態を識別するスイッチ機構とを有する画像形成装置において、
上記スイッチ機構が、上記装置本体側に配設されたスイッチと、その円弧表面上の一の接線に沿って形成された直線部分を有し、上記スイッチをその回転で作動させるカムと、その先端部の少なくとも一部に該先端部の移動方向に沿って形成され上記直線部分と当接可能な直線形状部を有し、その基端部で上記本体カバーに回動自在に支持され該本体カバーの閉時の移動により上記カムを回転させることが可能なレバーとからなり、
上記本体カバーが閉じるとき、上記レバーの先端部が上記直線部分に当接し上記カムを所定の角度回転させることにより上記スイッチを作動させた後、上記直線形状部と上記直線部分とが平行な状態で当接し、上記直線形状部が上記直線部分上をスリップしながら移動することによって、上記カムの回転が上記所定の角度に抑制されることを特徴とする画像形成装置。In an image forming apparatus having a main body cover that is openable and closable with respect to the apparatus main body, and a switch mechanism that identifies an open / closed state of the main body cover.
The switch mechanism includes a switch disposed on the apparatus main body side, a straight portion formed along one tangent on the arc surface, and a cam for operating the switch by its rotation, and a tip thereof A main body cover that is formed along at least a portion of the front end portion in a moving direction of the tip portion and that can be brought into contact with the straight portion and is rotatably supported by the main body cover at the base end portion thereof. It consists of a lever that can rotate the cam by moving when closed
When the body cover closes, the tip of the lever comes into contact with the linear portion and the cam is rotated by a predetermined angle to operate the switch, and then the linear shape portion and the linear portion are in a parallel state. The image forming apparatus is characterized in that the rotation of the cam is suppressed to the predetermined angle by moving the linearly shaped portion while slipping on the linear portion . 上記カムは、上記直線部分の近傍に被係止部材を有し、上記レバーの先端部は、上記被係止部材と対応する位置に係止部材を有し、
上記本体カバーが開くとき、上記被係止部材と上記係止部材とが係合して、上記カムを元の位置に戻すことを特徴とする請求項１記載の画像形成装置。 The cam has a locked member in the vicinity of the linear portion, and the tip of the lever has a locking member at a position corresponding to the locked member,
2. The image forming apparatus according to claim 1 , wherein when the main body cover is opened, the locked member and the locking member are engaged to return the cam to the original position . 上記レバーは、上記先端部近くで上記装置本体側に設けられたガイド部材に移動自在に案内されるものであり、該ガイド部材により上記本体カバーの開閉・移動範囲が規制されることを特徴とする請求項１または２記載の画像形成装置。 The lever is guided movably by a guide member provided on the apparatus main body side near the tip, and the opening / closing / moving range of the main body cover is regulated by the guide member. The image forming apparatus according to claim 1 or 2.
JP09690898A 1998-03-26 1998-03-26 Image forming apparatus Expired - Fee Related JP3753862B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP09690898A JP3753862B2 (en) 1998-03-26 1998-03-26 Image forming apparatus
CNB991041631A CN100357833C (en) 1998-03-26 1999-03-23 Image forming device
KR1019990010208A KR100324099B1 (en) 1998-03-26 1999-03-25 Reliable cover switch employing machine
US09/277,174 US6055394A (en) 1998-03-26 1999-03-26 Reliable cover switch employing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09690898A JP3753862B2 (en) 1998-03-26 1998-03-26 Image forming apparatus

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JPH11277842A JPH11277842A (en) 1999-10-12
JP3753862B2 true JP3753862B2 (en) 2006-03-08

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JPH11277842A (en) 1999-10-12
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KR100324099B1 (en) 2002-02-20
CN100357833C (en) 2007-12-26
KR19990078240A (en) 1999-10-25

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